A version of CompCert featuring an open module semantics, designed to target the framework of refinement-based game semantics.
This is a modified version of CompCert v3.6. The language semantics and correctness proofs have been updated to describe the behavior of individual compilation units. Most passes from Clight to Asm have been update, for the x86 architecture.
Since our compiler uses Clight as the source language, the first few passes are not available and the full extracted compiler cannot be built. However the Coq version of the Clight to Asm compiler can be compiled in the following way.
Build requirements are identical to those of CompCert v3.6. We recommend
using the opam package manager to set up a build environment. We have
tested CompCertO on Linux with the following opam installation:
% opam list
# Packages matching: installed
# Name # Installed # Synopsis
base-bigarray base
base-threads base
base-unix base
camlp5 7.14 Preprocessor-pretty-printer of OCaml
conf-findutils 1 Virtual package relying on findutils
conf-m4 1 Virtual package relying on m4
conf-perl 1 Virtual package relying on perl
conf-pkg-config 1.3 Virtual package relying on pkg-config installation
coq 8.9.1 pinned to version 8.9.1
coq-coq2html 1.2 Generates HTML documentation from Coq source files. Alternative to coqdoc
dune 2.8.2 Fast, portable, and opinionated build system
menhir 20201216 An LR(1) parser generator
menhirLib 20201216 Runtime support library for parsers generated by Menhir
menhirSdk 20201216 Compile-time library for auxiliary tools related to Menhir
num 1.4 The legacy Num library for arbitrary-precision integer and rational arithmetic
ocaml 4.08.1 The OCaml compiler (virtual package)
ocaml-config 1 OCaml Switch Configuration
ocaml-system 4.08.1 The OCaml compiler (system version, from outside of opam)
ocamlfind 1.8.1 A library manager for OCaml
You should be able to reproduce this installation with the following sequence of shell commands:
# Initialize opam (if you haven't used it before)
opam init --bare
# Create an "opam switch" dedicated to building CompCertO
opam switch create compcerto ocaml-base-compiler.4.08.1
# Install the necessary packages
opam repository add coq-released https://coq.inria.fr/opam/released
opam install coq.8.9.1 camlp5.7.14 menhir.20201216 coq-coq2html.1.2
# Configure the current shell to use the newly created opam switch
eval $(opam env)
In addition, our modifications rely on the Coqrel library, which must be built first. We will include Coqrel in any self-contained archive we distribute, but if you are working in a git clone, you must first retreive it with the following commands:
% git submodule init
% git submodule update
In any case, to build Coqrel, proceed in the following way:
% (cd coqrel && ./configure && make)
You can then build the updated proof as follows:
% ./configure x86_64-linux
% make
% make documentation
If appropriate to your setting, we recommend you use a -j option when invoking make so as to enable parallel compilation.
After running make documentation you will be able to browse the
generated documentation. We have annotated the
index file to highlight the changes and additions made in CompCertO.
The remainder of this document is the original README.md distributed
with CompCert v3.6.
The verified C compiler.
The CompCert C verified compiler is a compiler for a large subset of the C programming language that generates code for the PowerPC, ARM, x86 and RISC-V processors.
The distinguishing feature of CompCert is that it has been formally verified using the Coq proof assistant: the generated assembly code is formally guaranteed to behave as prescribed by the semantics of the source C code.
For more information on CompCert (supported platforms, supported C features, installation instructions, using the compiler, etc), please refer to the Web site and especially the user's manual.
CompCert is not free software. This non-commercial release can only
be used for evaluation, research, educational and personal purposes.
A commercial version of CompCert, without this restriction and with
professional support, can be purchased from
AbsInt. See the file LICENSE for more
information.
The CompCert verified compiler is Copyright Institut National de Recherche en Informatique et en Automatique (INRIA) and AbsInt Angewandte Informatik GmbH.
General discussions on CompCert take place on the [email protected] mailing list.
For inquiries on the commercial version of CompCert, please contact [email protected]